Using an aftermarket coating on the frame, inside doors, etc. can void the rust-through warranty. Sumpthin' to be aware of.
On my truck, in order to assist in fending off the effects of salted roads, I do what real men do. Rough tough men. Men that wrestle grizzly bears for fun and topple the biggest trees by biting through their trunks.......
use Liquid Glass to protect the paint, inner fender wells, etc.
I will be confronting the ravages of nature and man this winter with three, yes, count them, three coasts of Liquid Glass adhering to all painted surfaces I could reach with my grubby paws clenching the applicator pad laden with....
Liquid Glass.
Used to use Nu-Finish but found it to be a bit harsh on brand-new paint. And, Liquid Glass appears to last a little longer than Nu-Finish though your results may vary.
Nu-Finish and Liquid Glass are sealants. Waxes and polishes generally do not last as long as a sealant. No carnuba in sealants, that I am aware of.
Those lusting after maximum prettiness... girly-man wimpy politically correct prettines will opt for wax or polish. Rought tough burly men who would rather smell like a wet billy goat than walk around wafting girly-man clologne smells go with sealants.
One advantage of Liquid Glass is that it is easily layered. Multiple coats increase the applied product's thickness upon thine conveyance. Some sealants as well as waxes and polishes either can not be layered or the addition of extra coats provides only a small amount of extra protection.